High Efficiency AC Input 40A 6V Laser Driver
Figure 1. Front View Photo of the AAS6V40A2
Figure 2. Top View Photo of the AAS6V40A2
FEATURES
High Efficiency: ≥ 86%
Low Temperature Rise: 35℃
No Cooling Fan Required
Maximum Output Current: 40A
Current Accuracy: ±1%
Wide Input Voltage: 88VAC ~ 132VAC &
176VAC ~ 264VAC
Wide Output Voltage: 1.3V ~ 6V
Configurable Output Current and Maximum Output
Voltage
Short Circuit Protection
Over-current Protection
Over-temperature Protection
APPLICATIONS
Driving diode lasers with low noise and high stability, including fiber lasers, diode laser bars, etc.
DESCRIPTION
The AAS6V40A2 is an electronic module designed for driving diode lasers with up to 40A low noise current. The output current can be set by an analog voltage of 0 to 2.5V, or a potentiometer, to between 0 and 40A.
Figure 1 and 2 show photos of the AAS6V40A2.
The input voltage range can be selected to one of these 2 ranges by a mechanical switch: 88VAC to 132VAC or 176VAC to 264VAC, the frequency can be from 47Hz to 63Hz.
A high stability low noise 2.5V reference voltage is provided internally for setting the output current and maximum output voltage. This reference can also be used as the voltage reference for external ADCs (Analog to Digital Converters) and DACs (Digital to Analog Converters), which might be used for monitoring and/or setting the laser current and maximum output voltage, the so-called compliance voltage.
This laser driver module is highly efficiency, its efficiency
is > 86% efficiency. It saves energy and has low temperature rise. The module also conducts all its heat to its external chassis which serves as the heat-sink and heat conducting plate, therefore, no cooling fan is needed. Thus, there are no problems usually associated with the fan: noise, air turbulence, limited life time, etc. Mounting the module on a larger metal plate would reduce its temperature rise. Leaving the module on a free air environment is also ok.
There is an over-temperature protection circuit, in case the module’s temperature gets too high, the circuit will reduce the output current and the module will be working under constant temperature mode.
There is a soft-start and soft-cut circuit in the module, which gives smooth current transactions during up and power-down periods.
In case there is a short-circuit at the output, the internal protection circuit will cut off the output.
The output voltage is automatically set from 1.3V to 6V while keeping the output current at a pre-set value.
The control loop is monitored in real time by an internal circuit, to make sure that it works properly. The monitoring result is sent to the LPGD node. When this pin is pulled up internally, it indicates that the loop works fine.
SPECIFICATIONS
Table 1. Characteristics (TA = 25℃)
Parameter Symbol Test Condition Min. Typ. Max. Unit
Efficiency η Vin = 110V AC, Vout = 6V, Iout = 40A - 86 - %
Output Current Iout 0 Adjustable 40 A
Current Accuracy △I −20 ~ ℃ 50℃ - ±1 - %
88 110 132 VAC
Input Voltage Vin
176 220 264 VAC
Input Frequency ƒ 47 50 63 Hz
Output Voltage Vout 1.3 Adaptive 6 V
Operating
MECHANICAL DIMENSIONS
Figure 3. Pin Names and Locations
TERMINAL DESCRIPTIONS
Table 2. Terminal Introduction# Name Meaning Type Description
1, 2, 3 LDA Laser diode anode Power output Connect it to the anode of the laser diode. 4, 5, 6 LDC Laser diode cathode Power output Connect it to the cathode of the laser diode.
7 ACGND AC ground AC ground Connect it to AC ground. 8 ACN Neutral wire AC input Connect it to AC power supply.
Black terminal
9 ACL Live wire AC input Connect it to AC power supply.
1 EN Enable Digital input Internal 12K pull up resistor to 5V. Pulling this pin to GND will disable the driver. 2 LPGD Loop good indication Digital output When this pin is high (4V, ≤5mA), the control loop is working properly, otherwise, not properly. 3 INTL Interlock Digital input Connect to safety interlock switches. Open = off, connect to GND = run.
4, 9, 15 GND Ground Ground Connect ADC and DAC grounds to here. 5 LDAV Laser diode anode output voltage Analog output =Vout/3, Vout is laser diode anode output voltages.
D-Sub
6 LIO indication output Laser current Analog output An output voltage of 0 to 2.5V at this pin indicates the output current being 0 to 40A linearly. 41 112 1 2 3 4 5 6 7 8 9 200 50 180
7 LIS Laser current set Analog input
0V to 2.5V sets the output current from 0 to 40A linearly. This pin can be set by an external analog signal source, such as the output of a closed-looped op-amp, POT, or DAC. Input impedance is 10K.
8 PLSCN Pulse control Digital input TTL, 1 = on, 0 = off. 10 5V 5V Power output 5V 5mA.
5V Power output 5V 5mA. Part number: AAS6V40A2. 11
SYNCO
Optional 5V or Synchronization
output Digital output
This pin can be used as a clock signal for synchronizing other switch mode electronics, 100KHz. Part number: AAS6V40A2SN.
12 VLIM Laser voltage limit set Analog input 0V to 2.5V sets the laser output voltage from 1.3V to 6V linearly.
13 VREF Reference voltage Analog output
2.5V reference voltage. To be used for setting the output current and the output voltage limit. It can also be used by external ADCs and DACs if they are used for monitoring and/or setting the output parameters.
D-Sub
14 TEMPO Driver temperature indication output Analog output Operating internally temperature.
APPLICATION INFORMATION
Figure 4 shows a typical application circuit.
To AC Power Supply To AC Power Supply To AC Power Ground Laser 3 2 1 W1 10K 3 2 1 W2 10K To ADC To ADC To ADC To ADC 2 1 LED 1 R 250 2 1 2 SB1 D-Sub Black Terminal LDA 1 ACGND 7 ACN 8 ACL 9 LDA 2 LDA 3 LDC 4 LDC 5 LDC 6 GND 15 EN 1 LPGD 2 INTL 3 GND 4 LDAV 5 LIO 6 LIS 7 PLSCN 8 GND 9 5V 10 5V/SYNCO 11 VLIM 12 VREF 13 TEMPO 14 AAS6V40A2 1 2 SA2 1 2 SA1
Figure 4. A Typical Application Schematic The maximum output voltage and output current can be set
respectively by internal two POTs while VLIM or LIS are respectively float. They can also be set by an external analog signal source, such as the output of a closed-looped op-amp, POT, or DAC.
The maximum output voltage can be set by the W1 in the schematic shown in Figure 4, output current can be set by the potentiometer W2. When VLIM voltage changes from 0V to 2.5V, the maximum output voltage is set to 1.3V to
6V linearly. The relationship is: V_max = 2 × VLIM + 1 (V) The output current formula is: I_out = 16 × LIS (A)
VREF pin can by used as a 2.5V power supply, the maximum output current is 20mA.
Output current = 16 × LIO (A) The module’s temperature equation is: Temperature = 72 × TEMPO − 40 (℃)
When the TEMPO voltage changes from 0 to 2.5V, the temperature indicated is −40 ℃ to 140 . ℃
SYNCO provides pulses for synchronizing other switch-mode power supplies. The frequency is about 100KHz and the duty cycle is about 50%.
The enable control pin, EN, is used for enabling the power supply. The logic threshold voltage is about 2V. When this pin is pulled down, the laser driver disables. There is a 12K pull-up resistor tide to a 5V power supply internally. Leaving this pin unconnected or driving it to above the 2V threshold voltage will enable the laser driver.
The LPGD pin indicates the laser drivers works properly under constant current mode when this pin is pulled high. It can be used for driving an LED directly and the maximum output current is 5mA.
Caution
1. Please take the anti-static measures, such as wrist straps, when handling the module so as not to damage the module.
2. Always connect the module’s AC input with a proper cable in series with a switch and a plug, do not use stripped wires as the plug for connecting to the AC main socket. Make sure that the cable wires are firmly tighten by screw drivers onto the terminals to have reliable connections.
3. When making modifications on the connections, always turn off the power first.
4. Make sure that the polarity of the laser diode matches the polarity of the power supply’s output.
5. Carefully and patiently check the application circuit. When you sure it is absolutely correct, you can turn on power supply. When the LED indicator light is lit up, it indicates that control loop is already stable.
NAMING
A AS 6V 40A 2
Version: The second version Maximum output current: 40A Maximum output voltage: 6V Circuit type: AC input/output isolated Company code: Analog Technologies, Inc.
ORDERING INFORMATION
Table 3． Part Number
Part # Description
AAS6V40A2 High efficiency AC input laser driver, Iout_max = 40A, Vout_max = 6V, Pin 11 = 5V. AAS6V40A2SN High efficiency AC input laser driver, Iout_max = 40A, Vout_max = 6V, Pin 11 = SYNCO.
Table 4 Unit Price
Quantity 1 − 9 10 − 49 50 − 249 250 − 499 ≥500
AAS6V40A2
AAS6V40A2SN
$228 $198 $178 $158 $138
NOTICE
1. ATI warrants performance of its products for one year to the specifications applicable at the time of sale, except for those being damaged by excessive abuse. Products found not meeting the specifications within one year from the date of sale can be exchanged free of charge.
2. ATI reserves the right to make changes to its products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete.
3. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. Testing and other quality control techniques are utilized to the extent ATI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements.
4. Customers are responsible for their applications using ATI components. In order to minimize risks associated with the customers’ applications, adequate design and operating safeguards must be provided by the customers to minimize inherent or procedural hazards. ATI assumes no liability for applications assistance or customer product design.
5. ATI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of ATI covering or relating to any combination, machine, or process in which such products or services might be or are used. ATI’s publication of information regarding any third party’s products or services does not constitute ATI’s approval, warranty or endorsement thereof.
